Applet : Update applet text runtime

Hello,
I am new bee in Java. First I'm sorry if posting at wrong place.
I am developing a applet program which download the file from server to user system then install it and run it.
My issue is I want applet text to change according to process going on. If it is downloading file from server then it should display "downloading...", if it is installing then text should "Installing...", and at last "successfully installed..."
How can I do that? Please help me out.